Liquid crystal display driver and power supply

Details Liquid crystal display driver and power supply Liquid crystal display driver and power supply

1991-01-07

1993-06-01

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379387, 379354, 379413, H04M 102

Patent

active

052167100

ABSTRACT:
A liquid crystal display driver and power supply for use with a telephone dialing circuit reduces the potential of an external power supply to the telephone dialing circuit to a desired voltage level. The reduced potential is then stabilized and a second voltage signal, which is a function of the stabilized voltage signal, is generated to drive and supply power to a liquid crystal display of the telephone dialing circuit. The liquid crystal display driver and power supply and the telephone dialing circuit can be integrated in a single IC chip.

REFERENCES:
patent: 4086442 (1978-04-01), Rickard
patent: 4286120 (1981-08-01), Sublette
patent: 4341991 (1982-07-01), Geboers et al.
patent: 4521648 (1985-06-01), Hegi
patent: 4527016 (1985-07-01), Sublette
patent: 4564726 (1986-01-01), Ibata
patent: 4647787 (1987-03-01), Pommer, II
patent: 4723276 (1988-02-01), Rault
patent: 4736410 (1988-04-01), Nishida et al.
patent: 4748664 (1988-05-01), Blomley
patent: 4794640 (1988-12-01), Yeh

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